1 With latest versions of glibc, a lot of apps failed on a PaX enabled
3 cannot enable executable stack as shared object requires: Permission denied
5 This is due to PaX 'exec-protecting' the stack, and ld.so then trying
6 to make the stack executable due to some libraries not containing the
7 PT_GNU_STACK section. Bug #32960. <azarah@gentoo.org> (12 Nov 2003).
9 Patch also NPTL. Bug #116086. <kevquinn@gentoo.org> (20 Dec 2005).
11 diff -durN glibc-2.10.1.orig/nptl/allocatestack.c glibc-2.10.1/nptl/allocatestack.c
12 --- glibc-2.10.1.orig/nptl/allocatestack.c 2009-01-29 21:34:16.000000000 +0100
13 +++ glibc-2.10.1/nptl/allocatestack.c 2009-11-13 00:50:33.000000000 +0100
15 # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
17 if (mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
19 + if (errno != EACCES) /* PAX is enabled */
24 diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c glibc-2.10.1/sysdeps/unix/sysv/linux/dl-execstack.c
25 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c 2006-01-08 09:21:15.000000000 +0100
26 +++ glibc-2.10.1/sysdeps/unix/sysv/linux/dl-execstack.c 2009-11-13 00:50:33.000000000 +0100
32 + if (errno == EACCES) /* PAX is enabled */
43 - if (errno != ENOMEM) /* Unexpected failure mode. */
44 + if (errno == EACCES) /* PAX is enabled */
49 + else if (errno != ENOMEM) /* Unexpected failure mode. */
57 - if (errno != ENOMEM) /* Unexpected failure mode. */
58 + if (errno == EACCES) /* PAX is enabled */
63 + else if (errno != ENOMEM) /* Unexpected failure mode. */